I will be having fasting labwork (Chemistry (which includes blood glucose), HgA1C, Lipid Panel). I am trying NOT to get diabetes & was told I have pre-diabetes. I got my HgbA1C down from 6.5 to 4 & want to keep it that way! Only problem I have now is I have a job where I go to work at 4 am. I need my caffeine to wake up at 2am! Will 1 sugar free Red Bull effect the results of my lab that I'll have drawn 4-5 hours later? My job is very physical, so I burn a lot of calories. I walk between 15,000 to 17,000 steps within 4 hours everyday.